High Intensity Interval Training (HIIT)

by Angela (Oh She Glows) on March 15, 2010

Good morning!

Wow did I have a horrible sleep last night! My body did not want to go to sleep an extra hour early and I tossed and turned all night. My alarm was set for 6, but I didn’t get out of bed until 7:30…so I feel like I am running behind yet again today! The good news is today is a rest day for exercise, so I sort of have an ‘extra’ hour in my day today. ;)

I finally got around to trying out HIIT yesterday after many of you raved about it and told me I should try it out.

High Intensity Interval Training (HIIT)


[Note: Picture is from last summer]

What is HIIT?

  • It is exercise that involves intense bursts of exercise (e.g., sprinting) followed by moderate intensity exercise (e.g., jogging) repeated in an interval format.

How To Do HIIT:

  • “A HIIT session consists of a warm up period of exercise, followed by six to ten repetitions of high intensity exercise, separated by medium intensity exercise, and ending with a period of cool down exercise. The high intensity exercise should be done at near maximum intensity. The medium exercise should be about 50% intensity. The number of repetitions and length of each depends on the exercise. The goal is to do at least six cycles and go for about 15-20 minutes.” [Source]

Potential Benefits of HIIT:

  • A great way to maximize a workout that is limited on time!
  • Increase Resting Metabolic Rate (RMR) for the following 24 hours post-exercise
  • Might improve VO2 max (maximal oxygen consumption) more effectively as compared to traditional long aerobic workouts. [Source 1 & 2]

A few different types of HIIT:

For all of you HIIT pros, feel free to add your own info in the comments. I just did a quick read up on it and have a lot more to learn about it!

Yesterday I decided to try the 60-second HIIT advanced level workout. I typically train at an intense level during my normal workouts, so I thought I would be able to handle the 60-60 second split.


My HIIT Workout:

For my intense 60 second interval, I chose 8 mph, even though I probably could have done 9 mph. I decided to play it safe and see how it went. I can always build up over time.

Warm-up: 10 minute walking at incline 2%


  • 6 mph (10 min/mile) for 60 seconds, at incline 2%
  • 8 mph (7:30 min/mile) for 60 seconds, at incline 2%
  • Repeat, repeat, etc.
  • Number of sets: 14
  • Total time of HIIT: 28 mins.

Cool down: 5 mins. walking

My thoughts:

  • This HIIT workout made my tempo runs look like a walk in the park!!! It was crazy intense and I loved it.
  • I love that you can tailor HIIT for your own needs. I think it could be applied to a variety of exercises like cycling, swimming, or gym equipment like the Stairmaster.
  • I stopped for two quick water breaks around 8 minutes and 20 minutes. You will need water in a crazy way during this workout.
  • I zoned out and forgot about everything else.
  • I sweat a TON, much more in 28 minutes than I do for some runs that are an hour or more! Make sure to drink lots of water and have a post-workout snack within about 30-60 minutes of the HIIT.

Overall verdict:

I can’t believe I haven’t been doing this!!! I have done intervals before, but nothing as effective as this. I was blown away by how tough this was and by how amazing I felt afterwards. Total runner’s high. I will definitely be experimenting with HIIT on a  weekly basis.

Thank you to those of you who suggested I try HIIT out! I will be forever grateful. :mrgreen:

Do you ever include intervals in your training? Have you ever tried HIIT, if so, what did you think?


  • Today is the last day to get in your Glo Bar orders if you want it shipped out before I leave for vacation this weekend! Otherwise, I will not be shipping out orders again until the second week in April.
  • Need motivation to drink more water? Check out Project Hydrate.
  • March 15th-20th is Health Tip Week on OSG! Stay tuned all week for the most valuable tips, tricks, and lessons that I have learned along my road to health! :)

Stay tuned…


The best way to predict the future is to invent it. ~Alan Kay

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{ 77 comments… read them below or add one }

Heather (Where's the Beach) March 15, 2010 at 8:46 am

I absolutely LOVE HIIT workouts. If I have to run on the dreadmill, they are the only way I can manage to get through it!!!


Jessica @ How Sweet March 15, 2010 at 8:49 am

My favorite HIIT workout to do is 20 seconds on, 40 seconds off. I have a few workouts on my blog. They give me the BEST workout ever, but they are hard as heck. I look forward to them – it’s a pleasure pain. :)


Jennie {in Wonderland} March 15, 2010 at 8:51 am

I wonder if you can do HIIT workouts on the stairmaster or elliptical? I’m not quite ‘there’ yet on the dreadmill, and yet I don’t know if they would be as effective on other machines.

What do you think?


Elle @ Acquired Tastes March 15, 2010 at 8:52 am

Usually when I’m on the elliptical I push myself really hard for 30 seconds and then relax for 30 seconds. It keeps my heart rate high. Also, when I’m running I alternate running and walking. Not sure if this really qualifies as HIIT, but it works for me!

It kinda gives you something to look forward to mentally and you don’t get bored as easy ;)


GirlonRaw March 15, 2010 at 8:53 am

Hey there are some great ideas here for training. I think I’ll have to give it a shot. Thanks for this :)


Tiffany @ A Dantat's Life March 15, 2010 at 8:54 am

i love HIIT!! it doesn’t feel long at all because you’re constantly switching it up. kudos to you for doing a 1:1 ratio your first time! i’ve only recently moved from a 1:2 ratio to a 1:1.5 ratio. i would never be able to have my rest period be a jog/run! i have to bring it down to a walk to get my HR down far enough to reap the benefits of HIIT. otherwise it’s more like steady state high intensity for me.


Leah @ Simply Fabulous March 15, 2010 at 8:56 am

That pic from last summer looks like it could be from a magazine :)

HIIT workouts are awesome. I can’t wait to get back into them!


Jenny March 15, 2010 at 8:57 am

Gah! I love Canada- wish I could run outside in the woods like that… so jealous!


Jaya March 15, 2010 at 9:10 am

Angela, once you HIIT it, you never go back! Tabata workouts are also awesome. You can do Tabata with basically any anaerobic exercise. I don’t think I ever do steady-state energy work, unless it’s to flush the lactic acid out of my system, after a week of hard training. But I will say this, it’s recommended by almost everyone I know (physio, CSCS’s, physicians, etc) that you not exceed 2-3 HIIT/interval sessions a week. It is super taxing on your central nervous system and the harder you train, the harder you need to rest! HIIT and hard lifting/strength training will absolutely transform your body. I am sooo excited for you!


Maureen March 15, 2010 at 12:17 pm

what is TABATA?


Stephanie March 15, 2010 at 9:18 am

Great post! I’m really bad at doing any kind of speed/interval work. I think that I’ll definitely try to incorporate something like this at least once maybe twice in my week.

Thanks for the great info!


Samantha Angela @ Bikini Birthday March 15, 2010 at 9:19 am

I do 30s sprints at 10mph and 30s recovery at 6.7mph. I’d love to try HIIT on a track though because track running works your glutes a lot more than trying to catch up to a treadmill.

I usually do 10-15 intervals and don’t do a warm-up.


Heather (Heather's Dish) March 15, 2010 at 9:21 am

i’ve never done hit, but interval training is SO great…makes it go by faster and really pushes the limits :) i’ve always done some form of intervals for those very reasons! can’t wait for the health tips :)


Ameena March 15, 2010 at 9:25 am

HIIT is so hard but so effective…I just can’t get through too much of it! But it is great on the treadmill because it makes the time go so much faster!


Tracey @ I'm Not Superhuman March 15, 2010 at 9:28 am

I’ve never done HIIT, but I just wrote about a study that found HIIT was just as effective as endurance training for muscles. The amount of aerobic activity you’d have to do to get the same results as you get with HIIT is insane!


Jenna March 15, 2010 at 9:36 am

I didnt’ sleep good either! it’s the crazy time change! HIIT sounds great! It’s always been intimidating to me!


skinnyrunner March 15, 2010 at 9:37 am

haha, ive always wondered what HIIT stood for when i read it on blogs everywhere.


Lizzie March 15, 2010 at 9:37 am

I’ve done interval training during track and regular workouts (though just with running). You’ll see the difference when you race. I improved my 5K time last summer by 2:30. It’s tough to see when you’re in the middle of doing them and you just want to take a break, but the rewards do come! I haven’t done any lately (due to injury hiatus), so will be interesting to challenge myself back into them :) You’re amazing!


Angela March 15, 2010 at 9:46 am

I love to add in a HITT w/o once a week!! I find it really helps improve my overall running pace and it’s great for those days when you think you might be a tad bored doing the usually cardio. It goes by so fast!!


EaterNotARunner March 15, 2010 at 9:49 am

I use interval training but nothing that intense…I’ll have to check it out!


Estela @ Weekly Bite March 15, 2010 at 9:52 am

I heard so many good things about HIIT! I must try it!!


Lauren W March 15, 2010 at 10:00 am

I love HITT as well. My fav workout is the 60-60 split, but I change the incline as well as the pace. For the ‘meduim’ intensity, I do 4.1 mph at a 4.5 incline and then I change the higher intensity as I get higher in the reps (starting at 6.5 mph and working my way up to 9 mph by the last rep) and lower the incline to 2 during these reps. You definitely zone out and can’t concentrate on anything else! Makes the 30 min go by so quickly.


Chantal March 15, 2010 at 10:01 am

So glad you got around to trying HIIT! I swear by it (haha, I just made a typo and wrote ‘sweat’ instead of ‘swear’ which is true too!). In fact, I love it so much, I’m trying to incorporate more ‘endurance-paced’ days into my routine (the way you do!). I actually find that to be a lot more of a mental game! I’m all for mixing up my workouts as much as possible, it’s the funnest way to do it!


RunToTheFinish March 15, 2010 at 10:04 am

oh i like tips week that sounds fun!!

HIIT is a great tool. I try to vary it with doing other things like tempo work. great job!!


Jess - The Domestic Vegan March 15, 2010 at 10:11 am

I do something similar on my elliptical. Obviously I can’t choose the speed, but I vary the resistance & will run as fast as I can for 30 or 60 seconds, then slow back down to a normal pace for a couple minutes, then repeat, etc. I also do this going backwards on the elliptical & it’s a fun challenge! Makes the time go quicker, too!


Emmanuelle March 15, 2010 at 4:03 pm

I also do hiit on the elliptical sometimes, it is great and makes time go faster. I’ve never tried backwards but I’ll certainly give it a try!


Naomi (onefitfoodie) March 15, 2010 at 10:27 am

ahh HIIT love, it, do it and its so easy to do on any cardio machine! I have a whole page in my exercise section dedicated to HIIT and showing my readers how to and the benefits, just like you did here! :) awesome job!


Katrina March 15, 2010 at 10:43 am

I just did a HIIT workout on the beach while on vacation! It’s amazing and I believe it is the one quick way to get back on track if I’ve had a bad day of eating or if I’ve been low on intensity or if I just need a that kick-butt feeling. I adore HIIT.


Cole March 15, 2010 at 10:46 am

I can’t wait to read the health tips!


Jenn @ Livewellfit March 15, 2010 at 10:52 am

Oh I LOVE HIIT workouts!!! Granted they kick my behind like no other but I love them.

Here is what I have seen with weekly HIIT sessions:
– huge increase in overall stamina (can climb our 4 flights of stairs at all day with barely a change in my breathing)
– feel more power in my legs, more bounce
– higher calorie burn after workout than other forms of cardio
– great way to save time, workout hard and sweat even more!

I think HIIT should be a part of every fitness program to keep your body from acclimating to your routine. It is also a great way to change things up and you can do HIIT anywhere!!! :)


lindsay March 15, 2010 at 10:55 am

HIIT is like a cold shower, it stings at first but then it totally rejuvenates YOU! great job!


Monica @ Musings of the Granola Girl March 15, 2010 at 10:59 am

I have never tried HIIT, I sometimes push myself for 1 minute on the elliptical and then take 1 minute “easy” and do intervals of 5 – 10 minutes of high speed on the treadmill, but that’s probably the extent of it. I want to give it a try though! Thanks for this great post :)


Carolyn @ lovinlosing.com March 15, 2010 at 11:04 am

I recently read an article saying that short, less frequent high intensity workouts are much more effective than long and/or frequent low-moderate intensity workouts.


Kelly March 15, 2010 at 11:05 am

Man I love intervals but I’ve never tried this specific kind. Might have to try it out on the elliptical tonight!


Joelle (The Pancake Girl) March 15, 2010 at 11:25 am

Ooh you made that workout sound incredible- I actually want to try that now! Seems pretty cool, even though I’m sure it’s killer.


Anna @ Newlywed, Newly Veg March 15, 2010 at 11:35 am

Wow, that sounds…well, intense!! I’d love to give it a go!


Christine (The Raw Project) March 15, 2010 at 11:43 am

Great post, I need to incorporate more HIIT workouts into my schedule.


Lizz (Leading the Good Life) March 15, 2010 at 11:51 am

Great workout! I love how intervals make the time fly by.


[email protected] March 15, 2010 at 12:06 pm

I try to do some form of interval training once a week if not more. My favorite is to do it with weights. I have been doing barbell complexes more lately and in the summer will go back to throwing in some hill sprints!

Here is an article with some weighted complexes:



*Andrea* March 15, 2010 at 12:32 pm

you back is banging!!! so hot and strong!

can’t wait for the healthy tips – the graphic is gorg


Lindsay (Waking Up Hungry) March 15, 2010 at 12:42 pm

Thank you so much for this info! I only get about 20-30 minutes of workout time in the AM so this will be perfect on those days I want something really intense!


Jocelyn @ Peace.love.Nutrition March 15, 2010 at 1:00 pm

HIT is the way I can run on a treadmill ! i get bored any other way.


Andrew Lowry March 15, 2010 at 1:11 pm


I am pleased to see that you have discovered the joys of HIIT. In Turbulence Training (second time I mentioned that) HIIT is used for the endurance portion. Craig Ballantyne wrote about the rest period in his blog post today; http://turbulencetraining.blogspot.com/2010/03/big-interval-training-mistake.html

Your HIIT was intense and long. One thing I love about HIIT is that you can use many methods to do it – running, biking, rowing, bodyweight or kettlebell reps etc. I am currently doing intervals that involve a few hundred bodyweight reps broken up into sets – hard, intense and quick to do.

I am enjoying reading your blog.


Cassie @ A Very Busy Mind March 15, 2010 at 1:17 pm

Just joined the Project Hydrate challenge – such a good idea!

Love HIIT! I usually do my own versions of it (like sprinting through the chorus of songs). I already did a fair amount of interval training, but after I got my heart rate monitor and saw the difference intervals make in a workout, I became a die-hard fan!


Carbzilla March 15, 2010 at 1:29 pm

Great post! I had to look up HIIT a while ago when it kept popping up, but I haven’t tried it on my elliptical yet. I’m all about sweating and a shorter workout. Great explanation and links!


Paige @ Running Around Normal March 15, 2010 at 1:33 pm

I love HIIT workouts! I haven’t doone many lately, just because my half marathon training plan doesn’t call for them, and there’s little room to get in “optional” cardio training.
I usually do 30 seconds on 60 off or 20 seconds on, 40 off.


Cynthia (It All Changes) March 15, 2010 at 1:35 pm

I love intervals and do them on the treadmill and elliptical.


Angela @ A healthy fit March 15, 2010 at 1:36 pm

I love doing high intensity intervals when I am stuck on the treadmill. It makes the time fly and I sweat like a crazy beast.


Kelly March 15, 2010 at 1:37 pm

I was first introduced to HIIT when I was short on time but wanted an effective cardio workout. I read an article on SparkPeople about it and it offered a chart. I modified it to use on my recumbent bike. I now do HIIT once or twice a week. I will no longer sit on the bike for 45 minutes to an hour. When I workout I want it to be intense and effective.


Alison @ finnyfinds March 15, 2010 at 1:44 pm

Hi Angela! Nice workout and I’m glad you shared it with us. The first time I did a workout like that was recently and I posted about it here: http://finnyfinds.wordpress.com/2010/03/04/never-shall-i-belittle-the-treadmill-again/ (sorry to be a troll and leave my blog address in the comment – it’s just easier than recapping the whole thing). It gave me a lot of respect for treadmill workouts and a welcome break from the gray Rochester weather.


Cherry March 15, 2010 at 2:16 pm

We did a lot of HIIT/Interval Training/Circuit Training when I was in the military. I follow another exercise blog that you may (or may not) love (www.bodyrock.tv). The blogger does a lot of variations on HIIT and Tabata. I think it will give you more ideas for the way those two types of intense training can be incorporated into daily workouts. This is my first time commenting on yours or any blog! I love your blog and have been following it for almost a year now. You have such a “glow” about you and I appreciate all your great life/food recipes! Thanks for sharing pieces of your life!


Little Aspects March 15, 2010 at 2:48 pm

I love interval training – it really worked wonders for bringing my running times down. If you want to do intervals to help with longer running races (eg 10k) then 800m intervals are great. Run the 800m at your goal race pace for 5k (for arguments sake, 4min would be a 5min/km pace) then rest for half the amount of time you run the 800m in (eg2mins) then go again. Repeat 5 times (so 5x800m). The idea is to try to run the exact same pace for each 800m so that you’re training your body to run at that pace when you’re tired.

Other fantastic intense workouts are hill workouts – find yourself a decent hill that’s maybe 50m long and run up and down. There are a couple of ways you can do it – push yourself on the up and take it easy on the down, or push yourself for both and repeat 5x then rest for a minute then repeat the exercise again. This training is great if you livein a hilly area or you’re running in a hilly race.

Woah, long comment. All the best with your interval training – I swear, it becomes addictive after awhile!


Megan @ Healthy Hoggin' March 15, 2010 at 3:04 pm

I love HIIT workouts! It’s been too long since I’ve done one, though! Thanks for the reminder!

I love how sweaty I can get in just 30 minutes! :D


Nicole, RD March 15, 2010 at 3:14 pm

I love HIIT workouts, too! I get bored on a treadmill otherwise, and I love the challenge!

You’re like the millionth person (including myself) who slept horribly last night! Yuck!


Hannah March 15, 2010 at 3:27 pm

Totally awesome workout!!

How many miles was it in total?


Kristin (Cook, Bake and Nibble) March 15, 2010 at 3:30 pm

I LOVE HIIT workouts! They’re short, but brutal!



Lisa (bakebikeblog) March 15, 2010 at 3:59 pm

oooh HIIT is HARD – but oh so good!!!!


Katrina M March 15, 2010 at 5:07 pm

oooooh i can’t wait for this health tip week!!! :)

i did some HIIT last summer without really knowing it apparently, haha. i would go to the track at the middle school by my house…. walk there (a little less than half a mile), jog the first lap, or sometimes i would jog about a mile to get there, then on my laps around the lap i would sprint (haha, well i call it sprinting, but i actually run pretty slow!) the straights and then jog the corners…. usually i would do about 3 laps this way and then take a slow lap, and aim for 3-4 sprint sessions usually equalling out to about a half hour. good to know i was doing something good!! haha… i think this week or next week i’m going to try to do it again, it was challenging but fun too! :)


John March 15, 2010 at 5:40 pm

I’ve just been waiting for the local track to be free of snow to start doing this. I did my first hill run last week. So soon my HM training will be 1 speed run(HIIT), one hill run and my long run. all the things necessary to go faster:-)


Rachel March 15, 2010 at 5:49 pm

In the spin classes I teach I always throw at least 2 interval tracks in – love them!


Staceyhttp://stacey-healthylife.blogspot.com/ March 15, 2010 at 6:19 pm

You can also use HIT training in your other workouts and even with resistance training, alternating some sprints, cardio, or plyometrics. It burns a lot more calories because you are working at a higher exertion rate. I love HIT training it is such a calorie burner and keeps the body guessing.


Kristen @ Simply Savor March 15, 2010 at 6:25 pm

looove HIIT training! I’m an AFAA certified group fitness and Zumba instructor and I teach a strength conditioning class specifically designed around the HIIT concept! I split up the body into major muscle groups–biceps, triceps, chest, back, glutes, legs, abs. I do 3 exercises for each body part with free weights or body weight, followed by a 1 minute cardio interval (jumping jacks, burpees, football feet, etc.), and then move on to the next body part. It’s one of the most effective ways to burn fat and build muscle at the same time, and increases your calorie burn tremendously, even after you’ve stopped working out, and my clients love the fast pace (they say it takes their mind off of the difficulty). So glad you mentioned this! Thanks Angela!


Allison @ Food For Healing March 15, 2010 at 6:34 pm

my bf made me a HIIT plan once before a long time ago, haven’t done it since


Sebrina March 15, 2010 at 7:26 pm

So nice to meet you!! I found your blog today while I was doing a search for lululemon, lol. I can’t believe how much we have in common! the more I read through your archives the more I saw. I have bengal cat as well. I an also a lulu addict. I love to run and recently became a vegan.

Can’t wait to read more of your blog!!


Emily March 15, 2010 at 7:58 pm

Hi Angela! Regarding HIIT, “true” HIIT means that you are working at *peak* intensity during the high intensity intervals — meaning that you’re sprinting as though you’re being chased by a bear. For that reason, “true” HIIT should NEVER be done on a treadmill, because you’re very likely to fall off and hurt yourself. Once it warms up, HIIT is best done outdoors :)


Emily March 15, 2010 at 7:59 pm

I actually got in the best shape of my life a year ago by building up my HIIT workouts. I began by running a mile and then running 10 sets of 60 second intervals with walks in between. By 4 months later I was running 40 minutes of 60 on 60 off at 4.5 2% incline a between 7.5-8 at the same incline.

I want to get that back! Working at it again for the summertime :)


Jolene (www.everydayfoodie.ca) March 15, 2010 at 8:52 pm

My hubby is a runner and hadn’t heard of this … I just told him about it and he is going to try it!


Bridget @PavementandPlants March 15, 2010 at 9:16 pm

I LOVE IT!!!!! I can only suggest programming a really great playlist for it. It’s amazing what you’re capable of when you push!!!!!!!!!!


Nicole March 15, 2010 at 9:43 pm

Hi Angela! I’ve been reading OSG for a while now and just wanted to say hello!

The place in the picture from summer looks like a beautiful place to run!

I’m really looking forward to Health Tip Week. :)


Pam (Pamcakes and Eggs) March 16, 2010 at 7:41 am

I tried the HIIT thing last night after reading your post. Hmmm. The treadmills at the gym have an interval program that is 2 minutes/2 minutes. Sooo I learned last night that 2 minutes at 7.5 mph is TOUGH. ahhhh. I made it through 20 minutes then had to walk for a bit. Definitely going to try the HIIT again (mainly because I like typing HIIT).


SoVeryFabulous March 16, 2010 at 12:48 pm

I’m guilty of not going to the gym regularly (though I’m trying to change that!) but when I do go, I love doing HIIT. It’s a great way to challenge yourself and get a great workout in and save time as well.


natalie @ nono2yoyo March 16, 2010 at 2:39 pm

I love HIIT. I have several techniques that I love.
Here are a few:
start a your level 6 on a 1-10 scale, 1 being EASY and 10 being you are giving it 100%.
Level 6 one min
Level 7 one min
Level 8 one min
Level 9 one min
Level 10 one min
go back to six and work your way back up to 10. After you have done this four times, hit your level 10 for two minutes at the end.
Level 6 one min
level 7 one min
Level 8 one min
Level 9 one min
Level 10 one min
Level 9 one min
level 8 one min
level 7 one min
Level 6 one min and then work your way back up and down for as many times as you’d like.

The last kind of HIIT that I love is called Guerillas. This is where you give it your all 100% for 20-30 seconds and then rest for 10 and then back on it for 20-30 seconds and then rest again for 10. You can rotate types of exercises or stay all on one machine…this is KILLER. You can get a HARD CORE intense butt kicking workout in less than 15-20 minutes!


Susan March 16, 2010 at 4:44 pm

I almost only ever do HIIT! My favourite is 15 minutes of 1 minute sprints (ie as fast as I can possibly go) followed by 2 minutes recovery (ie walking). It’s a fun way to finish of a weight lifting workout with a little bit of heart-pumping cardio :)


Lee March 16, 2010 at 5:36 pm

I’m fortunate to live in a tiny coastal town, so get to enjoy my intervals training on the beach. Most Sundays you will find me busily dodging the seagulls, while dreaming of the hot shower awaiting me ;-)


JenRD March 17, 2010 at 7:47 am

Do you have any good playlists or music suggestions for HIIT? I find that a good beat really keeps me going! Thanks!


janelle March 23, 2010 at 10:45 am

Loved your workout. I find that interval training is especially effective. My favorites include doing hill repeats using the jog down hill back to the start as the “cool down” period in between each set. It’s a great way to burn calories and strength. The workout that you posted here is awesome as well because so many of us hit the gym to do strength training followed by cardio. Thanks for posting this :)



Dan August 15, 2015 at 2:35 am

Great post. HIIT seem to be the way forward. As a convert to HIIT I have seen and felt the benefits already. I’ve also read good evidence that you’re less likely to over eat in compensation after HIIT rather than after cardio which is good news! I think the key thing as in life is a little of everything, mix up some cardio with some HIIT for the greatest benefits to mind and body. HIIT programs are great, but your right they need to be done only when the users have an appropriate level of fitness to start with. Great post. Some really good advice.


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